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NECO Expo Chemistry Questions and Answers Expo 2022/2023
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(i) KAl(SO₄)₂. 12H₂O
Number of moles of sodium reascted = reacting mass/molar mass
Number of moles of oxygen reacted = (1/4) x Number of sodium
= 1/4 x (3.6/23)
Reacting mass of oxygen = Number of moles x molar mass
= 0.03913 x (16×2)
Air in gaseous form is first passed through caustic soda to remove CO₂. It is compressed and cooled until ut becomes a liquid at -200°C. It is then led to a fractionating column. On distillation, Nitrogen which has a lowet boiling point of -196°C is evolced first leaving behind Oxygen in liquid form. Further heating converts the liquid to a gas at -183°C.
(i) It is used for combustion
(ii) It is used for artificial respiration
This is because room temperature is warmer
(i) Methyl orange
An ion is an atom or molecule which has a net electric charge due to the loss or gain of one or more electrons.
HCl gas doesn’t contain ions
(i) Noble gases: Neon, Helium
(ii) Halogens: Iodine, Fluorine
(iii) Alkaline earth metals: Calcium, Magnesium
Halogens attain stable octet configuration by accepting an electron from donors Group I elements.
A sol is a colloid where solid particles are dispersed in liquid medium.
(i) Acid-base titrations are used to determine the percentage purity of a substance
(ii) Acid-base titrations are important to determine the number of water molecules in a hydrate.
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